CN104021769A - Shifting register, grid integration drive circuit and display screen - Google Patents
Shifting register, grid integration drive circuit and display screen Download PDFInfo
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- CN104021769A CN104021769A CN201410240531.8A CN201410240531A CN104021769A CN 104021769 A CN104021769 A CN 104021769A CN 201410240531 A CN201410240531 A CN 201410240531A CN 104021769 A CN104021769 A CN 104021769A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
- G06F3/04184—Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3674—Details of drivers for scan electrodes
- G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C19/00—Digital stores in which the information is moved stepwise, e.g. shift registers
- G11C19/28—Digital stores in which the information is moved stepwise, e.g. shift registers using semiconductor elements
- G11C19/287—Organisation of a multiplicity of shift registers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/0286—Details of a shift registers arranged for use in a driving circuit
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/06—Details of flat display driving waveforms
- G09G2310/061—Details of flat display driving waveforms for resetting or blanking
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/08—Details of timing specific for flat panels, other than clock recovery
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- Theoretical Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Computer Hardware Design (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention discloses a shifting register, a grid integration drive circuit and a display screen. The joint of a source of a first thin film transistor and a drain of a second thin film transistor is set as a first upward-pull node, the joint of a capacitor and a grid of a third thin film transistor is set as a second upward-pull node, and a electric leakage prevention module is added between the first upward-pull node and the second upward-pull node; the first upward-pull node and the second upward-pull node are connected in display time duration of a frame through the electric leakage prevention module under the control of a display control signal end so that a grid startup signal can be normally outputted by the shifting register; the first upward-pull node and the second upward-pull node are disconnected in the touch control time duration of the frame, that is, a resistor with large resistance is connected to a discharge path of the capacitor in series, and therefore time of the capacitor for discharge can be greatly shortened, the electric leakage speed of the capacitor is effectively decreased, and the problem that normal display may not be achieved when the capacitor is applied to a touch screen with high report rate is solved.
Description
Technical field
The present invention relates to technical field of liquid crystal display, relate in particular to a kind of shift register, grid integrated drive electronics and display screen.
Background technology
At Thin Film Transistor-LCD (TFT-LCD, Thin Film Transistor Liquid Crystal Display) in, conventionally provide gate drive signal by gate drive apparatus to the grid of each thin film transistor (TFT) (TFT, Thin Film Transistor) of pixel region.Gate drive apparatus can be formed on the array base palte of liquid crystal display by array processes, be the capable driving of array base palte (Gate Driver on Array, GOA) technique, this integrated technique not only provides cost savings, and can accomplish the design for aesthetic of liquid crystal panel (Panel) both sides symmetry, simultaneously, also saved grid integrated circuits (IC, Integrated Circuit) binding (Bonding) region and the wiring space of fan-out (Fan-out), thereby can realize the design of narrow frame; And this integrated technique can also save the Bonding technique of grid line direction, thereby production capacity and yield are improved.
Existing grid line integrated drive electronics, as shown in Figure 1a, formed by multiple shift registers, each shift register is for providing gated sweep signal to the grid line being connected with the signal output part of this shift register, and input reset signal to the reset signal end of the upper shift register being adjacent, to the signal input part input trigger pip of the next shift register being adjacent.As shown in Figure 1 b, for the structural representation of an existing shift register, use 4 thin film transistor (TFT) M1-M4 and a capacitor C 1 can realize the most basic shift-register functions, specific works principle is as follows: in the time of signal input part Input input high level signal, the first film transistor M1 conducting on to draw node be PU node charging, now the 3rd thin film transistor (TFT) M3 conducting; In the time of clock signal terminal CLK input high level signal, the high level signal that the 3rd thin film transistor (TFT) M3 of conducting provides signal output part Output clock signal end CLK, simultaneously because the boot strap of capacitor C 1 is further drawn high PU node; Afterwards, when reset signal end Reset input high level signal, the second thin film transistor (TFT) M2 and the 4th thin film transistor (TFT) M4 conducting, to PU node and signal output part Output electric discharge.
When the array base palte that has an above-mentioned GOA circuit in use is made embedded touch-screen, for the report point rate that improves touch-control is to improve touch-control effect, a frame time of liquid crystal display can be divided into multiple displaying time sections and the touch-control time period of hocketing.Like this, GOA circuit, only becomes in the work of displaying time section continuously successively to connected grid wire size line output grid start signal from original, and GOA circuit all quit work in multiple touch-control time period of a frame time.In example GOA as shown in Figure 1a, between N-1 level shift register and N level shift register, be provided with the touch-control time period, after the work of N-1 level shift register, signal output part by N-1 level shift register has made the current potential of the PU node in N level shift register draw high to the trigger pip of the signal input part input of N level shift register, but the 3rd thin film transistor (TFT) M3 in N level shift register need to be through just meeting conducting of a touch-control time period, now, PU node is in (Floating) state that floats, capacitor C 1 starts electric discharge, one of its discharge path (in Fig. 1 b shown in dotted line) is to low voltage signal end VSS by the second thin film transistor (TFT) M2, another is to high voltage signal end VDD by the first film transistor M1, cause PU node to occur leaky, especially the second thin film transistor (TFT) M2 is that its size of non-display area that is produced on display screen causes more greatly its leakage current larger, the voltage source that can accelerate PU node is to the low voltage signal end VSS in electronegative potential.After the process touch-control time period, the 3rd thin film transistor (TFT) M3 conducting in N level shift register, the signal of signal output part output should be the stack of PU node voltage and clock control signal terminal voltage, but the voltage of PU node reduces, cause the lower voltage of signal output part output, make the grid start signal on connected signal line too low, finally cause display screen normally not show.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of shift register, grid integrated drive electronics and display screen, the problem that cannot normally show occurring in the time being applied to the touch-screen of high report point rate in order to solve existing GOA circuit.
Therefore, the embodiment of the present invention provides a kind of shift register, comprising:
The first film transistor, its grid is connected with signal input part, draining is connected with the first reference signal end, and source electrode is connected with drawing node on first;
The second thin film transistor (TFT), its grid is connected with reset signal end, drain electrode with on described first, draw that node is connected, source electrode is connected with the second reference signal end;
The 3rd thin film transistor (TFT), its grid with on second, draw that node is connected, drain electrode is connected with clock signal terminal, source electrode is connected with signal output part;
The 4th thin film transistor (TFT), its grid is connected with touch-control control signal end, drain electrode is connected with described signal output part, source electrode is connected with low voltage signal end, described touch-control control signal end, at the 4th thin film transistor (TFT) described in the conducting of touch-control time period, disconnects described the 4th thin film transistor (TFT) in displaying time section;
Electric capacity, it is connected on described second and draws between node and described signal output part;
Anticreep module, it is connected on display control signal end, described first and draws on node and described second and draw between node, for under the control of described display control signal end, described in the conducting of displaying time end, drawing on node and described second on first and drawing node, disconnecting and on described first, draw the connection of drawing node on node and described second in the touch-control time period.
The above-mentioned shift register that the embodiment of the present invention provides, the tie point of the drain electrode of the transistorized source electrode of the first film and the second thin film transistor (TFT) is set to draw on first node, the tie point of the grid of electric capacity and the 3rd thin film transistor (TFT) is set to draw on second node, on first, draw to draw on node and second and between node, increase an anticreep module, this module is under the control of display control signal end, in the displaying time section conducting first of a frame, draw on node and second and draw node, make shift register realize normal grid start signal output; Disconnect on first and draw the connection of drawing node on node and second in the touch-control time period of a frame, be equivalent to the resistance that resistance is larger of connecting in the discharge path of electric capacity, can greatly slow down the time of capacitor discharge, effectively reduce the electric leakage speed of electric capacity, avoided a frame time of touch-screen to be divided into the problem that cannot normally show that multiple displaying time sections of hocketing and touch-control time period may occur when improving touch-control report point rate.
In a kind of possible embodiment, in the above-mentioned shift register providing in the embodiment of the present invention, described anticreep module, specifically comprise: the 5th thin film transistor (TFT), its grid is connected, drains and draws on first that node is connected, source electrode is connected with drawing node on second with described display control signal end.
In a kind of possible embodiment, in the above-mentioned shift register providing in the embodiment of the present invention, all thin film transistor (TFT)s that comprise in described shift register are N-type thin film transistor (TFT);
In displaying time section, described display control signal end provides high level signal, and described touch-control control signal end provides low level signal;
In the touch-control time period, described display control signal end provides low level signal, and described touch-control control signal end provides high level signal.
In a kind of possible embodiment, in the above-mentioned shift register providing in the embodiment of the present invention, while starting forward scan, in displaying time section, described the first reference signal end provides high level signal, and described the second reference signal end provides low level signal;
In the touch-control time period, described the first reference signal end and described the second reference signal end provide high level signal simultaneously.
In a kind of possible embodiment, in the above-mentioned shift register providing in the embodiment of the present invention, while starting reverse scan, in displaying time section, described the first reference signal end provides low level signal, and described the second reference signal end provides high level signal;
In the touch-control time period, described the first reference signal end and described the second reference signal end provide high level signal simultaneously.
In a kind of possible embodiment, in the above-mentioned shift register providing in the embodiment of the present invention, also comprise: drop-down module, it is connected on described display control signal end, first and draws on node, second and draw between node, signal output part and low voltage signal end, draws for maintaining within the non-working time of described shift register that on node, second, to draw node and signal output part be low level on described first.
In a kind of possible embodiment, in the above-mentioned shift register providing in the embodiment of the present invention, described drop-down module, specifically comprises:
The 6th thin film transistor (TFT), its drain electrode is connected with described display control signal end, source electrode is connected with pull-down node;
The 7th thin film transistor (TFT), its drain electrode is connected with described pull-down node, grid with on described second, draw that node is connected, drain electrode is connected with described low voltage signal end;
The 8th thin film transistor (TFT), its grid is connected with described display control signal end respectively with drain electrode, source electrode is connected with the grid of the 6th thin film transistor (TFT);
The 9th thin film transistor (TFT), its drain electrode is connected with the source electrode of the 8th thin film transistor (TFT), grid with on described second, draw that node is connected, source electrode is connected with described low voltage signal end;
The tenth thin film transistor (TFT), its drain electrode with on described first, draw that node is connected, grid is connected with described pull-down node, source electrode is connected with described low voltage signal end;
The 11 thin film transistor (TFT), its drain electrode is connected with described signal output part, grid is connected with described pull-down node, source electrode is connected with described low voltage signal end.
The embodiment of the present invention provides a kind of grid line integrated drive electronics, comprises above-mentioned any shift register that the example example multiple of the present invention of series connection provides;
Except first shift register and last shift register, all the other each shift registers are all inputted trigger pip to the signal input part of the next shift register being adjacent, and input reset signal to the reset signal end of the upper shift register being adjacent; First shift register is to the signal input part input trigger pip of second shift register; Last shift register is to the reset signal end input reset signal of self and a upper shift register.
The embodiment of the present invention provides a kind of display screen, comprises the above-mentioned grid integrated drive electronics that the embodiment of the present invention provides.
Brief description of the drawings
Fig. 1 a is the structural representation of existing GOA circuit;
Fig. 1 b is the structural representation of existing shift register;
One of structural representation of the shift register that Fig. 2 provides for the embodiment of the present invention;
Two of the structural representation of the shift register that Fig. 3 provides for the embodiment of the present invention;
Fig. 4 a and Fig. 4 b are respectively the forward scan of shift register and the sequential chart of reverse scan that the embodiment of the present invention provides;
The concrete input and output sequential chart of the shift register that Fig. 4 c provides for the embodiment of the present invention;
One of structural representation of the shift register with drop-down module that Fig. 5 provides for the embodiment of the present invention;
Two of the structural representation of the shift register with drop-down module that Fig. 6 provides for the embodiment of the present invention;
The structural representation of the grid line integrated drive electronics that Fig. 7 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of shift register, grid integrated drive electronics and the display screen that the embodiment of the present invention is provided is described in detail.
A kind of shift register that the embodiment of the present invention provides, as shown in Figure 2, comprising:
The first film transistor T 1, its grid is connected with signal input part Input, draining is connected with the first reference signal end Ref1, and source electrode is connected with drawing node PU1 on first;
The second thin film transistor (TFT) T2, its grid is connected, drains and draws on first that node PU1 is connected, source electrode is connected with the second reference signal end Ref2 with reset signal end Reset;
The 3rd thin film transistor (TFT) T3, its grid with on second, draw that node PU2 is connected, drain electrode is connected with clock signal terminal CLK, source electrode is connected with signal output part Output;
The 4th thin film transistor (TFT) T4, its grid is connected with touch-control control signal end CT2, drain electrode is connected with signal output part Output, source electrode is connected with low voltage signal end VSS, touch-control control signal end CT2, at touch-control time period conducting the 4th thin film transistor (TFT) T4, disconnects the 4th thin film transistor (TFT) T4 in displaying time section;
Capacitor C 1, it is connected on second and draws between node PU2 and signal output part Output;
Anticreep module, it is connected on display control signal end CT1, first and draws on node PU1 and second and draw between node PU2, for under the control of display control signal end CT1, in displaying time end conducting first, draw on node PU1 and second and draw node PU2, disconnect on first and draw the connection of drawing node PU2 on node PU1 and second in the touch-control time period.
The above-mentioned shift register that the embodiment of the present invention provides, the tie point of the drain electrode of the source electrode of the first film transistor T 1 and the second thin film transistor (TFT) T2 is set to draw on first node PU1, the tie point of the grid of capacitor C 1 and the 3rd thin film transistor (TFT) T3 is set to draw on second node PU2, on first, draw to draw on node PU1 and second and between node PU2, increase an anticreep module, this module is under the control of display control signal end CT1, in the displaying time section conducting first of a frame, draw and on node PU1 and second, draw node PU2, make shift register realize normal grid start signal output, disconnect on first and draw the connection of drawing node PU2 on node PU1 and second in the touch-control time period of a frame, be equivalent to the resistance that resistance is larger of connecting in the discharge path of capacitor C 1, can greatly slow down the time that capacitor C 1 is discharged, effectively reduce the electric leakage speed of capacitor C 1, avoided a frame time of touch-screen to be divided into the problem that cannot normally show that multiple displaying time sections of hocketing and touch-control time period may occur when improving touch-control report point rate.
It should be noted that, in the shift register providing in the embodiment of the present invention, the source electrode of thin film transistor (TFT) and drain electrode are according to the difference of transistor types and input signal, and its function can be exchanged, and does not do concrete differentiation at this.
Preferably, for the ease of implementing, in the above-mentioned shift register providing in the embodiment of the present invention, anticreep module, as shown in Figure 3, can specifically comprise: the 5th thin film transistor (TFT) T5, its grid is connected, drains and draws on first that node PU1 is connected, source electrode is connected with drawing node PU2 on second with display control signal end CT1.
Particularly, in the 5th thin film transistor (TFT) T5 of the anticreep module of conduct increasing in the above-mentioned shift register providing in the embodiment of the present invention and shift register, other thin film transistor (TFT) generally all adopts the thin film transistor (TFT) of identical material, in the specific implementation, generally all adopt N-type thin film transistor (TFT).
In the specific implementation, for the signal output part that ensures the above-mentioned shift register that the embodiment of the present invention provides can normally be exported grid start signal in each displaying time section of a frame, in displaying time section, display control signal end CT1 can provide stable high level signal always, make the 5th thin film transistor (TFT) T5 in conducting state, on first, draw on node PU1 and second and draw between node PU2 in conducting state; Accordingly, touch-control control signal CT2 end provides stable low level signal always, ensures that the 4th thin film transistor (TFT) T4 is in cut-off state.In the touch-control time period, display control signal end provides stable low level signal always, makes the 5th thin film transistor (TFT) T5 in cut-off state, draws on node PU1 and second on first and draws between node PU2 in off-state; Accordingly, touch-control control signal end CT2 provide stable high level signal always, ensures that the 4th thin film transistor (TFT) T4 is in conducting state, with the voltage of degrade signal output terminal Output, ensures no signal output.
Further, because signal input part and reset signal end in the above-mentioned shift register providing in the embodiment of the present invention are symmetric design, can exchange by practical function, the above-mentioned shift register that therefore embodiment of the present invention provides can be realized bilateral scanning.
Usually, in the time starting forward scan, as shown in Fig. 4 a, at displaying time section (Display), the first reference signal end Ref1 provides high level signal, and the second reference signal end Ref2 provides low level signal.Preferably, in order further to slow down the electric leakage speed of capacitor C 1, at touch-control time period (Touch), the second reference signal end Ref2 can be set to high level, the second reference signal end Ref2 and the first reference signal end Ref1 provide high level signal simultaneously, can further slow down like this flowing of electric current.
Usually, in the time of reverse forward scan, as shown in Figure 4 b, at displaying time section (Display), the first reference signal end Ref1 provides low level signal, and the second reference signal end Ref2 provides high level signal.Preferably, in order further to slow down the electric leakage speed of capacitor C 1, at touch-control time period (Touch), the first reference signal end Ref1 can be set to high level, the first reference signal end Ref1 and the second reference signal end Ref2 provide high level signal simultaneously, can further slow down like this flowing of electric current.
Below in conjunction with the input and output sequential chart of the Fig. 3 shown in the shift register shown in Fig. 3 and Fig. 4 c, as an example of forward scan example, the course of work of embodiment of the present invention shift register is done to describe.Particularly, choose the T1～T4 four-stage in the input and output sequential chart as shown in Fig. 4 c.In following description, represent high level signal with 1,0 represents low level signal.
At T1 stage, Input=1, CLK=0, Reset=0, Ref1=1, Ref2=0, CT1=1, CT2=0.Due to CT1=1, therefore the 5th thin film transistor (TFT) T5 conducting, draws on first and on node PU1 and second, draws node PU2 conducting; Due to Input=1, therefore the first film transistor T 1 conducting control shift register and start working, the first reference signal end Ref1 will be drawn node PU2 to draw high and be that capacitor C 1 is charged by the first film transistor T 1 on second.While drawing node PU1 to be high level on second, the 3rd thin film transistor (TFT) T3 conducting, but due to CLK=0, therefore signal output part Output output low level signal.The T1 stage is the charging stage of capacitor C 1 in this shift register.
The T2 stage, Input=0, CLK=0, Reset=0, Ref1=1, Ref2=1, CT1=0, CT2=1.Now, the first film transistor T 1, the second thin film transistor (TFT) T2 and the 5th thin film transistor (TFT) T5 cut-off, on second, draw node PU2 to keep high level, and while drawing node PU2 to be high level on second, the 3rd thin film transistor (TFT) T3 conducting, but due to CLK=0, therefore signal output part Output output low level signal, and CT2=1, the 4th thin film transistor (TFT) T4, in conducting state, can drag down the noise of signal output part Output in time.The T2 stage is the touch-control time period.
The T3 stage, Input=0, CLK=1, Reset=0, Ref1=1, Ref2=0, CT1=1, CT2=0.Due to Input=0, therefore the first film transistor T 1 ends, and the boot strap of capacitor C 1 will draw node PU2 further to draw high on second.Due to CLK=1, therefore conducting when the 3rd thin film transistor (TFT) T3 draws node PU2 to be high level on second, and by the high level output on clock signal terminal CLK to signal output part Output, and then by signal output part Output by this high level output to a line grid line corresponding with shift register, the all thin film transistor (TFT)s that are positioned on this row signal line in the viewing area of liquid crystal panel are opened, and data signal line starts write signal.The T3 stage is the stage that this shift register is opened.
The T4 stage, Input=0, CLK=0, Reset=1, Ref1=1, Ref2=0, CT1=1, CT2=0.Due to Reset=1, therefore the second thin film transistor (TFT) T2 conducting.After the second film crystal T2 conducting, will on second, draw node PU2 to be pulled low to the low level of the second reference signal end Ref2 in theory.And while drawing node PU1 to become low level from high level on second, the 3rd thin film transistor (TFT) T3 becomes cut-off state from conducting state, and due to CLK=0, therefore signal output part Output output low level signal.The T4 stage is the discharge regime of capacitor C 1 in this shift register.
In real work, in the T4 stage, the voltage that draws node PU2 on second is progressively from high to low, the 3rd thin film transistor (TFT) T3 is progressively from being conducting to cut-off, in this process, can not ensure signal output part Output noiseless output (noise of signal output part Output generally can produce along with drawing on second noise of node PU2 to produce).Therefore, in the above-mentioned shift register providing in the embodiment of the present invention, in order to reduce the noise that draws node PU2 and signal output part Output on second, as shown in Figure 5, generally also comprise: drop-down module, it is connected on display control signal end CT1, first and draws on node PU1, second and draw between node PU2, signal output part Output and low voltage signal end VSS, on first, draw for maintaining that on node PU1, second, to draw node PU2 and signal output part Output be low level within the non-working time of shift register, to fall low noise output.
In the specific implementation, the drop-down module in the above-mentioned shift register that the embodiment of the present invention provides, as shown in Figure 6, can specifically comprise:
The 6th thin film transistor (TFT) T6, its drain electrode is connected with display control signal end CT1, source electrode is connected with pull-down node PD;
The 7th thin film transistor (TFT) T7, its drain electrode is connected with pull-down node PD, grid with on second, draw that node PU2 is connected, drain electrode is connected with low voltage signal end VSS;
The 8th thin film transistor (TFT) T8, its grid is connected with display control signal end CT1 respectively with drain electrode, source electrode is connected with the grid of the 6th thin film transistor (TFT) T6;
The 9th thin film transistor (TFT) T9, its drain electrode is connected with the source electrode of the 8th thin film transistor (TFT) T8, grid with on second, draw that node PU2 is connected, source electrode is connected with low voltage signal end VSS;
The tenth thin film transistor (TFT) T10, its drain electrode with on first, draw that node PU1 is connected, grid is connected with pull-down node PD, source electrode is connected with low voltage signal end VSS;
The 11 thin film transistor (TFT) T11, its drain electrode is connected with signal output part Output, grid is connected with pull-down node PD, source electrode is connected with low voltage signal end VSS.
Below in conjunction with the input and output sequential chart shown in the shift register shown in Fig. 6 and Fig. 4 c, as an example of forward scan example, the course of work of the drop-down module in embodiment of the present invention shift register is done to describe.
In T1 and T2 stage, due to CT1=1, therefore the 8th thin film transistor (TFT) T8 conducting makes the 6th thin film transistor (TFT) T6 conducting, the voltage of pull-down node PD is drawn high, make the tenth thin film transistor (TFT) T10 and the 11 thin film transistor (TFT) T11 in conducting state, thereby on node PU1 and second, draw the noise of node PU2 and signal output part Output to export to low voltage signal end VSS by drawing on first.
The T3 stage, because the boot strap of capacitor C 1 will draw node PU2 further to draw high on second, make the 7th thin film transistor (TFT) T7 and the 9th thin film transistor (TFT) T9 in conducting state, the voltage of pull-down node PD is dragged down, make the tenth thin film transistor (TFT) T10 and the 11 thin film transistor (TFT) T11 in cut-off state, ensure the normal output of signal output part Output.
The T4 stage, owing to will drawing node PU2 to drag down on second after the second film crystal T2 conducting, make the 7th thin film transistor (TFT) T7 and the 9th thin film transistor (TFT) T9 in cut-off state, the voltage of pull-down node PD is drawn high gradually from voltage, make the tenth thin film transistor (TFT) T10 and the 11 thin film transistor (TFT) T11 in conducting state, thereby on node PU1 and second, draw the noise of node PU2 and signal output part Output to export to low voltage signal end VSS by drawing on first.
Below be only the concrete structure that illustrates drop-down module in shift register, in the specific implementation, the concrete structure of drop-down module is not limited to the said structure that the embodiment of the present invention provides, and can also be other known structures of those skilled in the art, does not limit at this.
Based on same inventive concept, the embodiment of the present invention also provides a kind of grid line integrated drive electronics, as shown in Figure 7, comprise multiple shift registers of series connection, except first shift register and last shift register, the signal output part Output of all the other each shift registers all inputs trigger pip to the signal input part of the next shift register being adjacent, and inputs reset signal to the reset signal end of the upper shift register being adjacent; The signal output part Output of first shift register is to the signal input part input trigger pip of second shift register; The signal output part Output of last shift register is to the reset signal end input reset signal of self and a upper shift register.
For convenience of description, in Fig. 7, only show five shift registers, be respectively N-2 level shift register, N-1 level shift register, N level shift register, N+1 level shift register, N+2 level shift register.Wherein, the signal output part Output (n) of N level shift register is not only to connected signal line output grid start signal, also to N-1 level shift register output reset signal, simultaneously also to N+1 level shift register output trigger pip.
Particularly, the concrete structure of the each shift register in above-mentioned grid line integrated drive electronics is all identical on function and structure with the above-mentioned shift register of the present invention, repeats part and repeats no more.
Based on same inventive concept, the embodiment of the present invention also provides a kind of display screen, comprises above-mentioned grid integrated drive electronics, and its concrete enforcement can be referring to the description of above-mentioned grid integrated drive electronics, and something in common repeats no more.
The above-mentioned shift register that the embodiment of the present invention provides, grid integrated drive electronics and display screen, the tie point of the drain electrode of the transistorized source electrode of the first film and the second thin film transistor (TFT) is set to draw on first node, the tie point of the grid of electric capacity and the 3rd thin film transistor (TFT) is set to draw on second node, on first, draw to draw on node and second and between node, increase an anticreep module, this module is under the control of display control signal end, in the displaying time section conducting first of a frame, draw on node and second and draw node, make shift register realize normal grid start signal output, disconnect on first and draw the connection of drawing node on node and second in the touch-control time period of a frame, be equivalent to the resistance that resistance is larger of connecting in the discharge path of electric capacity, can greatly slow down the time of capacitor discharge, effectively reduce the electric leakage speed of electric capacity, avoided a frame time of touch-screen to be divided into the problem that cannot normally show that multiple displaying time sections of hocketing and touch-control time period may occur when improving touch-control report point rate.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if these amendments of the present invention and within modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (9)
1. a shift register, is characterized in that, comprising:
The first film transistor, its grid is connected with signal input part, draining is connected with the first reference signal end, and source electrode is connected with drawing node on first;
The second thin film transistor (TFT), its grid is connected with reset signal end, drain electrode with on described first, draw that node is connected, source electrode is connected with the second reference signal end;
The 3rd thin film transistor (TFT), its grid with on second, draw that node is connected, drain electrode is connected with clock signal terminal, source electrode is connected with signal output part;
The 4th thin film transistor (TFT), its grid is connected with touch-control control signal end, drain electrode is connected with described signal output part, source electrode is connected with low voltage signal end, described touch-control control signal end, at the 4th thin film transistor (TFT) described in the conducting of touch-control time period, disconnects described the 4th thin film transistor (TFT) in displaying time section;
Electric capacity, it is connected on described second and draws between node and described signal output part;
Anticreep module, it is connected on display control signal end, described first and draws on node and described second and draw between node, for under the control of described display control signal end, described in the conducting of displaying time end, drawing on node and described second on first and drawing node, disconnecting and on described first, draw the connection of drawing node on node and described second in the touch-control time period.
2. shift register as claimed in claim 1, it is characterized in that, described anticreep module, specifically comprises: the 5th thin film transistor (TFT), its grid is connected, drains and draws on first that node is connected, source electrode is connected with drawing node on second with described display control signal end.
3. shift register as claimed in claim 2, is characterized in that, all thin film transistor (TFT)s that comprise in described shift register are N-type thin film transistor (TFT);
In displaying time section, described display control signal end provides high level signal, and described touch-control control signal end provides low level signal;
In the touch-control time period, described display control signal end provides low level signal, and described touch-control control signal end provides high level signal.
4. shift register as claimed in claim 3, is characterized in that, while starting forward scan, in displaying time section, described the first reference signal end provides high level signal, and described the second reference signal end provides low level signal;
In the touch-control time period, described the first reference signal end and described the second reference signal end provide high level signal simultaneously.
5. shift register as claimed in claim 3, is characterized in that, while starting reverse scan, in displaying time section, described the first reference signal end provides low level signal, and described the second reference signal end provides high level signal;
In the touch-control time period, described the first reference signal end and described the second reference signal end provide high level signal simultaneously.
6. the shift register as described in claim 1-5 any one, it is characterized in that, also comprise: drop-down module, it is connected on described display control signal end, first and draws on node, second and draw between node, signal output part and low voltage signal end, draws for maintaining within the non-working time of described shift register that on node, second, to draw node and signal output part be low level on described first.
7. shift register as claimed in claim 6, is characterized in that, described drop-down module, specifically comprises:
The 6th thin film transistor (TFT), its drain electrode is connected with described display control signal end, source electrode is connected with pull-down node;
The 7th thin film transistor (TFT), its drain electrode is connected with described pull-down node, grid with on described second, draw that node is connected, drain electrode is connected with described low voltage signal end;
The 8th thin film transistor (TFT), its grid is connected with described display control signal end respectively with drain electrode, source electrode is connected with the grid of the 6th thin film transistor (TFT);
The 9th thin film transistor (TFT), its drain electrode is connected with the source electrode of the 8th thin film transistor (TFT), grid with on described second, draw that node is connected, source electrode is connected with described low voltage signal end;
The tenth thin film transistor (TFT), its drain electrode with on described first, draw that node is connected, grid is connected with described pull-down node, source electrode is connected with described low voltage signal end;
The 11 thin film transistor (TFT), its drain electrode is connected with described signal output part, grid is connected with described pull-down node, source electrode is connected with described low voltage signal end.
8. a grid line integrated drive electronics, is characterized in that, comprises multiple shift registers as described in claim 1-7 any one of series connection;
Except first shift register and last shift register, all the other each shift registers are all inputted trigger pip to the signal input part of the next shift register being adjacent, and input reset signal to the reset signal end of the upper shift register being adjacent; First shift register is to the signal input part input trigger pip of second shift register; Last shift register is to the reset signal end input reset signal of self and a upper shift register.
9. a display screen, is characterized in that, comprises grid integrated drive electronics as claimed in claim 8.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410240531.8A CN104021769B (en) | 2014-05-30 | 2014-05-30 | A kind of shift register, grid line integrated drive electronics and display screen |
| EP14861121.3A EP3151235B1 (en) | 2014-05-30 | 2014-11-10 | Shift register, gate integrated drive circuit, and display screen |
| PCT/CN2014/090747 WO2015180420A1 (en) | 2014-05-30 | 2014-11-10 | Shift register, gate integrated drive circuit, and display screen |
| US14/443,589 US9766741B2 (en) | 2014-05-30 | 2014-11-10 | Shift register, gate integrated driving circuit and display screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410240531.8A CN104021769B (en) | 2014-05-30 | 2014-05-30 | A kind of shift register, grid line integrated drive electronics and display screen |
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| Publication Number | Publication Date |
|---|---|
| CN104021769A true CN104021769A (en) | 2014-09-03 |
| CN104021769B CN104021769B (en) | 2016-06-15 |
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|---|---|---|---|
| CN201410240531.8A Active CN104021769B (en) | 2014-05-30 | 2014-05-30 | A kind of shift register, grid line integrated drive electronics and display screen |
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| Country | Link |
|---|---|
| US (1) | US9766741B2 (en) |
| EP (1) | EP3151235B1 (en) |
| CN (1) | CN104021769B (en) |
| WO (1) | WO2015180420A1 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP3151235A4 (en) | 2017-12-27 |
| WO2015180420A1 (en) | 2015-12-03 |
| US9766741B2 (en) | 2017-09-19 |
| EP3151235B1 (en) | 2020-03-11 |
| EP3151235A1 (en) | 2017-04-05 |
| CN104021769B (en) | 2016-06-15 |
| US20160266699A1 (en) | 2016-09-15 |
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